I don't really have a favorite, but overall I thought it was a good year for horror movies. Looking at the Wikipedia list, I think Weapons was probably the closest thing to being a "favorite".

I was actually impressed with Final Destination Bloodlines. My expectations were super low, but still happy with how it worked out.

28 Years Later was interesting and pretty solid. I also thought Frankenstein was pretty solid. That one's tough because I was somehow simultaneously expecting it to be a let down, if not just outright bad, but at the same time I have a lot of confidence in Del Toro, so I also expected it to be pretty good. I think it delivered, certainly was entertaining.